Vehicle brake



May 8, 1928. 1,669,072

G. H. VINETTE VEHICLE BRAKE .Y Filed July l5. 1926 INVEN'ToR,

ATTORNEY.y

Patented MayA 8, 1928.

UNITED STATES T-naTlaNTOFFICE.-

GEORGE vNETTE, OF DETROIT, MICHIGAN.

VEHICLE BRAKE.

.Application filed July 3,

The present invention relatesto fluid pressure brakes and means foroperating them. Among the objects of the invention 1s to `simplit'y andreduce th'e'cost of the construction of such brakes and at the same timerender them more.eiticient.

Another object of the invention is a simple. compact and eflicientoperating mechanism for fluid pressure brakes adapted to give a smoothpowerful application when needed in emergencies or a light braking whenin ordinary use. f

Other objects will readily appear to those skilled in the art uponreference to the following description and drawings', 'in Whichz* Fig. 1is an4 elevation of the brake operating means;

Carried by plate 6 in position to be expanded into contact with drum isa iexible brakeband 7 provided With a suitable friction' surfacematerial 8. The band Willbe supported, at the side opposite theoperating mechanism, by a conventional stirrup 9 co-acting with spring10 and the stud 11,

the latter being carriedby plate 6.

The band 7 formed into a ring is adapted to have its, free ends pressedapart to thereby increase its diameter and cause contact with the drum5. This expanding action as well as the supporting and anchoring ofthefree ends of the band is accomplished in the present invention by iXingthe lugs to the free ends of the band, these lugs being provided withopenings 16 which taper `to- Ward each other and are generally parallelto the adjacent portions ot the band and A have semi-cylindrical orsemi-spherical seats 17 at the smaller ends of the openings which seatsare in the Vsurfaces of the lugs opposed to each other as indicated.Extending through, openings 16 'arethe short. ends of levers 2O whichare pivoted as at 21 to plate 6 at a point back of the bandas indicatedand Whose long ends extend toward each other asshovvn. In Fig. l' thelevers 20 are shown as bent in the Jform of a.. hook With 1926. serialNo. 120,394.

the pivot point at the bend. The extreme portion of the short end oflever 20 Will be threaded and provided with a nut 22 and rounded washer23 adapted to tit the seat 17. By this means proper adjustment may beprovid-ed.

The operation of the brakes will be ac.- complished by moving outwardlythe longl ends ot' thelevers 20 and this is best accomplished byfo'rnnng' on these ends gear teeth 25 adapted to coact Witha double rack2G carried by the piston rod 27 ot' a iuid pressure actuatingr cylinder28 anchored as by lugs 29 to plate 6 and supplied from a suit-- ablesource of pressure Huid through conduit 30. f

The form of device shown in Fig. 2 is the same as that of Fig. 1 exceptthat the levers 20a instead of being bent as in Fig. 1 are branched andpivoted at the yend of lone of the branches While-the other branchextends through lug 1-5. On account'of the form of this lever theadjusting nut 22a'will be at the hilt of the branch and not at its tip.I i

The operation of the two forms is identical except that in one form apull and in the lother a push is exerted on the end of the bandto expandthe same and move the end outwardly against the drum.

The braking reaction is taken on stud 11 and one of the levers 20 or20".'`

The return of the brake is accomplished A by means of a tension spring50 connecting the ends ofthe band 7.

Having now described the inventien and the preferred form of embodimentthereof, it is to be understood that the said invention -is notto belimited to the speciic details and a plate at one end thereof, aflexible internal brake bandadaptedto be expanded noA against said drum,a pair of levers pivoted intermediate their ends on said plate andlevers extending toward each other, said levers being so arranged as tocause the band each having an arm connected to and sup to expand whensaid other arms are moved porting a free end of said band, the pivotsot' said levers being separated a greater distanee `than the points ofconnection of their arms to said band, the other arms of said leversextending toward each other, said levers being so arranged as to Causethelband ,to expand when said other arms are moved outwardly, and meansto move said last men tioned lever arms outwardly.

3. A brake mechanism Comprising a drum and a plateat one end thereof, aflexible internal brake band adapted t0 be expanded against said drum, apair 'of levers pivoted vintermediate their ends on sai-d plate and eachhaving anarm connected to and-supporting a free endof saidband, thepivots of said levers being separated a greater distance than the pointsof connection of their arms to'said band, the other arms of saidoutwardly, and fluid pressure means to move the ends of said lastmentioned lever arms substantially radially.

4. A brake mechanism comprising a drum and a plate at one end thereof,an internal brake band adapted to be expanded against said drum andhaving lugs at its ends, said lugs having holes extending parallel tosaid plate and substantially parallel to the adjacent outer surfaces ofthe band, a pair of levers pivoted on said plate, the pivots of saidlevers being spaced a greater 'distance apart than said lugs, saidlevers having arms extending through said holes in the lugs, ad-

]us't-able means 0n said arms engaging the' -lugs, the other arms ofsaid levers extending toward each other, and means to move saidlast'uamed arms.

GEORGE HT vrNETTE.

